package com.wally.netty.server;

import java.util.Date;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import lombok.extern.slf4j.Slf4j;


@Slf4j
public class TimeServerHandler extends ChannelHandlerAdapter {
	
	private int counter;
	
	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) 
			throws Exception {
		ByteBuf buf = (ByteBuf) msg;//将msg转换成Netty的ByteBuf对象
		byte[] req = new byte[buf.readableBytes()];//获取缓冲区可读的字节数，根据可读的字节数创建byte数组
		buf.readBytes(req);//将缓冲区中的字节数组复制到新建的byte数组中
		String body = new String(req, "UTF-8").substring(0, req.length - System.getProperty("line.separator").length());
		log.info("The time server receive order : {} ; the counter is : {}", body, ++counter);
		String currentTime = "QUERY TIME ORDER".equalsIgnoreCase(body) ? new Date(System.currentTimeMillis()).toString()
				: "BAD ORDER";
		currentTime += System.getProperty("line.separator");
		ByteBuf resp = Unpooled.copiedBuffer(currentTime.getBytes());
		ctx.writeAndFlush(resp);//异步发送应答消息给客户端
	}
	
	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
		ctx.close();
	}
}





